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Stock-Based Compensation - Deferred Stock Unit, Performance-Based Stock Unit and Restricted Stock Activity (Detail) (Deferred stock units, performance-based stock units and restricted stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred stock units, performance-based stock units and restricted stock [Member]
   
Unvested, shares    
Unvested, Beginning Balance 317us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Granted 231us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
167us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Vested (78)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
(67)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Forfeited (15)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
(130)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Unvested, Ending Balance 455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
317us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Weighted Average Grant Date Fair Value    
Unvested, Beginning Balance $ 15.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
$ 13.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Granted $ 19.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
$ 17.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Vested $ 17.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
$ 16.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Forfeited $ 15.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
$ 13.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
Unvested ,Ending Balance $ 17.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember
$ 15.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sfe_RestrictedStockUnitAndPerformanceStockUnitAndDeferredStockUnitMember